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Grade 27 Titanium vs. ASTM B780 Alloy

Grade 27 titanium belongs to the titanium alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
83
Elongation at Break, % 27
1.1 to 9.1
Poisson's Ratio 0.32
0.36
Shear Modulus, GPa 41
30
Shear Strength, MPa 180
200 to 340
Tensile Strength: Ultimate (UTS), MPa 270
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 420
140
Specific Heat Capacity, J/kg-K 540
270
Thermal Expansion, µm/m-K 8.7
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 4.5
10

Common Calculations

Stiffness to Weight: Axial, points 13
4.5
Stiffness to Weight: Bending, points 35
14
Strength to Weight: Axial, points 17
9.1 to 16
Strength to Weight: Bending, points 21
11 to 15
Thermal Shock Resistance, points 21
16 to 29

Alloy Composition

Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.080
0
Copper (Cu), % 0
23.5 to 25.7
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Nickel (Ni), % 0
0.35 to 0.65
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Ruthenium (Ru), % 0.080 to 0.14
0
Silver (Ag), % 0
74 to 76
Titanium (Ti), % 99 to 99.92
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0 to 0.4
0